(Original post by shahlakh)
yeah pal seriously........... i also wish. do u think they will repeat any of the experiments that have previously come?

they might ask from the experiments that came before, but they will have to change a lot and i dont know how they can change the beetroot experiment for instance. and if they dont change, and ask (eg beetroot) then the exam would be like the one in 2009 :O so either way is good they will either ask from what we solved through the past papers or they will ask totiopotency and observing mitosis. İ believe they will ask something they didnt ask before. or could be daphnia because it was in sample assesment, so doesnt really count as "came in the exam before".. dont know .. hope we all do well

(Original post by demdil)
they might ask from the experiments that came before, but they will have to change a lot and i dont know how they can change the beetroot experiment for instance. and if they dont change, and ask (eg beetroot) then the exam would be like the one in 2009 :O so either way is good they will either ask from what we solved through the past papers or they will ask totiopotency and observing mitosis. İ believe they will ask something they didnt ask before. or could be daphnia because it was in sample assesment, so doesnt really count as "came in the exam before".. dont know .. hope we all do well

yeah and as one guy stated here that what will the students of june 2013 do if all the experiments would have come up???

(Original post by mrperfect)
Thanks to those who answered. How can I make the root tip experiment safer and more accurate?

Use gloves when dealing with HCL or orcein
If your using orcein as your stain, make sure to avoid skin contact cuz its corrosive and highly flammable. Wear eye protection(safety goggles)
and to improve accuracy, first thing that comes to mind is repeat the experiment a few times using the same vol of HCL,stain etc, same length of root, eg:5mm
u cud even repeat it using a different root tip like broad bean.

all the best man, even im pretty nervous, im just memorising all the experiments from the CGP book and doing the past papers from june 09 to jan 12, hope it all works out. Also I asked my teacher what might come in ques 2, u know that article thing, he told me to learn the lifestyle and risk factors(heart disease and stuff) and clinical trial, Obviously im not depending on that, but he's been right before so who knows :P

(Original post by verdikt)
Goggles, gloves are the main keypoints. Also take care when cutting.

I heard something about not adding excess stain to it. Is this a safety measure and if so, can anyone explain why?

adding excess stain comes under precaution. Normally you add stain to darken the chromosomes in the root so mitosis can be observed more clearly, so adding too much stain might make the chromosomes even darker which wud make it difficult to observe mitosis...